CN109373653B - Unit electronic expansion valve opening correction method, control device and air conditioning system - Google Patents

Unit electronic expansion valve opening correction method, control device and air conditioning system Download PDF

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Publication number
CN109373653B
CN109373653B CN201811209844.1A CN201811209844A CN109373653B CN 109373653 B CN109373653 B CN 109373653B CN 201811209844 A CN201811209844 A CN 201811209844A CN 109373653 B CN109373653 B CN 109373653B
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China
Prior art keywords
expansion valve
electronic expansion
current
value
temperature
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CN201811209844.1A
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Chinese (zh)
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CN109373653A (en
Inventor
周潮
李立民
张仕强
武连发
冯涛
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN201811209844.1A priority Critical patent/CN109373653B/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00Arrangement or mounting of control or safety devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/89Arrangement or mounting of control or safety devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00Control inputs relating to air properties
    • F24F2110/10Temperature

Abstract

The application relates to a unit electronic expansion valve opening correction method, control equipment and an air conditioning system. The method for correcting the opening degree of the electronic expansion valve of the unit comprises the following steps: acquiring current working parameters of the unit; determining a current target opening value according to the current working parameters; when the fault that the opening degree of an electronic expansion valve of the unit is inaccurate is detected according to the current working parameters, the electronic expansion valve is reset; and adjusting the opening degree of the reset electronic expansion valve according to the current target opening degree value. By the aid of the method and the device, accuracy of opening of the electronic expansion valve can be improved, and accordingly operational reliability of a unit is improved.

Description

Unit electronic expansion valve opening correction method, control device and air conditioning system
Technical Field
The application relates to the technical field of electrical equipment, in particular to a method for correcting the opening degree of a unit electronic expansion valve, control equipment and an air conditioning system.
Background
Electronic expansion valves are commonly used in air conditioning units, refrigeration units, and the like. The electronic expansion valve is arranged in a pipeline of the unit, and the liquid supply amount passing through the pipeline can be controlled and adjusted by sending a command to the electronic expansion valve to adjust the opening of the electronic expansion valve. The liquid supply amount influences the operational reliability, so whether the opening of the electronic expansion valve is accurate or not influences the operational reliability of the whole unit.
In a traditional unit, a reset action of an electronic expansion valve is generally executed during starting, so that the actual step number of the electronic expansion valve is ensured to be consistent with the commanded step number in the running process. However, if the electronic expansion valve has a fault of inaccurate opening degree during operation, the fault cannot be processed in time, so that the unit has low operation reliability. For example, in an air conditioning unit, an electronic expansion valve may regulate the flow of refrigerant to a heat exchanger. If the electronic expansion valve is blocked in the refrigeration operation, no refrigerant flows through the indoor heat exchanger, and no refrigeration effect is achieved; if the heat pump is stuck during heating operation, the heating effect is not achieved; for the indoor unit which is shut down during refrigeration, if the electronic expansion valve is not closed tightly, a refrigerant flows through the electronic expansion valve, and the refrigerant still returns to the compressor in a liquid state because the fan is not started for heat exchange, so that liquid impact can be caused and the compressor can be damaged in serious cases.
Disclosure of Invention
Therefore, it is necessary to provide a method for correcting the opening degree of an electronic expansion valve of a unit, a control device and an air conditioning system, which can improve the operation reliability of the unit, in order to solve the problem of low operation reliability of the conventional unit caused by low accuracy of the opening degree of the electronic expansion valve.
A method for correcting the opening degree of a unit electronic expansion valve comprises the following steps:
acquiring current working parameters of the unit;
determining a current target opening value according to the current working parameters;
when the fault that the opening degree of the electronic expansion valve of the unit is inaccurate is detected according to the current working parameters, the electronic expansion valve is reset;
and adjusting the opening degree of the reset electronic expansion valve according to the current target opening degree value.
A control device comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:
acquiring current working parameters of the unit;
determining a current target opening value according to the current working parameters;
when the fault that the opening degree of the electronic expansion valve of the unit is inaccurate is detected according to the current working parameters, the electronic expansion valve is reset;
and adjusting the opening degree of the reset electronic expansion valve according to the current target opening degree value.
An air conditioning system comprises an air conditioning unit and the control device, wherein the air conditioning unit comprises a heat exchanger and an electronic expansion valve communicated with the heat exchanger through a pipeline, and the control device is connected with the electronic expansion valve.
According to the unit electronic expansion valve opening correction method, the control device and the air conditioning system, the current target opening value is determined according to the current working parameters of the acquired unit, when the electronic expansion valve is detected to have an inaccurate opening fault according to the current working parameters, the electronic expansion valve is reset, and the reset opening of the electronic expansion valve is adjusted according to the current target opening value, so that the inaccurate opening fault of the electronic expansion valve is automatically detected and corrected. Because the electronic expansion valve is reset, the inaccurate step number can be corrected after the opening degree of the reset electronic expansion valve is adjusted according to the current target opening degree value, so that the actual opening degree value of the corrected electronic expansion valve is basically equal to the current target opening degree value, the accuracy of the opening degree of the electronic expansion valve is improved, and the operation reliability of the unit is improved.
Drawings
FIG. 1 is a schematic flow chart illustrating a method for correcting an opening of an electronic expansion valve of a unit according to an embodiment;
FIG. 2 is a schematic flow chart illustrating a method for correcting an opening of an electronic expansion valve of a unit according to another embodiment;
FIG. 3 is a schematic flow chart illustrating a method for correcting an opening degree of an electronic expansion valve of a unit according to another embodiment;
FIG. 4 is a flowchart illustrating a specific process of resetting an electronic expansion valve of a plant when an inaccurate opening degree fault of the electronic expansion valve is detected according to current operating parameters according to an embodiment;
FIG. 5 is a schematic flow chart illustrating a method for correcting the opening degree of an electronic expansion valve of a unit according to still another embodiment;
fig. 6 is an internal configuration diagram of the control device in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, as shown in fig. 1, there is provided a method for correcting an opening degree of a set electronic expansion valve, which is described by taking the method as an example applied to a control device, and includes the following steps:
s120: and acquiring the current working parameters of the unit.
The unit is a unit comprising an electronic expansion valve. The current operating parameters of the unit are parameters in the operating process of the unit, and may include, for example, state parameters of the unit itself, and an ambient temperature of an environment where the unit is located. Specifically, the control device may receive data acquired by the parameter acquisition unit correspondingly to obtain the current working parameter. For example, for temperature data, the control device may receive a temperature collected by a temperature sensor.
S140: and determining the current target opening value according to the current working parameters.
The current target opening degree value is a target value which the opening degree of the electronic expansion valve needs to reach under the working condition corresponding to the current working parameter. Specifically, the control device may search for the current target opening value from the stored data according to the current working parameter by querying the database. The control device may also determine the current target opening value by using a calculation model representing a correspondence between the operating parameters and the opening values.
S160: and when the fault that the opening degree of the electronic expansion valve of the unit is inaccurate is detected according to the current working parameters, resetting the electronic expansion valve.
The inaccurate opening fault refers to a fault that the opening of the electronic expansion valve is inaccurate, and specifically refers to a fault that the current actual opening value of the electronic expansion valve does not match the current target opening value. The current actual opening value of the electronic expansion valve is not matched with the current target opening value, which means that the current actual opening value of the electronic expansion valve is not consistent with the current target opening value, or that the deviation value of the current actual opening value of the electronic expansion valve and the current target opening value exceeds an acceptable range.
The electronic expansion valve reset means that the opening degree of the electronic expansion valve returns to the initial position, and the initial position is specifically the position with the opening degree of which the step number is 0. Specifically, the control device may control the electronic expansion valve to reset by sending a reset instruction to the electronic expansion valve; the reset command is used for controlling the electronic expansion valve to reset.
S180: and adjusting the opening degree of the reset electronic expansion valve according to the current target opening degree value.
Specifically, the control device may send a correction instruction to the electronic expansion valve according to the current target opening value, and control the opening of the electronic expansion valve to be adjusted to the current target opening value.
According to the method for correcting the opening degree of the electronic expansion valve of the unit, the current target opening degree value is determined according to the current working parameters of the unit, when the electronic expansion valve is detected to have an inaccurate opening degree fault according to the current working parameters, the electronic expansion valve is reset, and the reset opening degree of the electronic expansion valve is adjusted according to the current target opening degree value, so that the inaccurate opening degree fault of the electronic expansion valve is automatically detected and corrected. Because the electronic expansion valve is reset, the inaccurate step number can be corrected after the opening degree of the reset electronic expansion valve is adjusted according to the current target opening degree value, so that the actual opening degree value of the corrected electronic expansion valve is basically equal to the current target opening degree value, the accuracy of the opening degree of the electronic expansion valve is improved, and the operation reliability of the unit is improved.
The method for correcting the opening degree of the electronic expansion valve of the unit can be applied to indoor air conditioning units. In one embodiment, the current operating parameter includes a current indoor ambient temperature. Correspondingly, step S140 includes: and if the current indoor environment temperature is matched with the preset target environment temperature, taking the preset shutdown target opening value as the current target opening value.
An indoor air conditioning unit is in a cooling/heating stop state in one stage during the working process. The cooling/heating stop state refers to a state in which the unit does not need to perform the cooling/heating operation when the indoor ambient temperature has reached the target temperature to be adjusted by the air conditioning unit. And when the current indoor environment temperature is matched with the preset target environment temperature, the air conditioning unit is in a cooling/heating stop state. Specifically, the current indoor environment temperature is matched with the preset target environment temperature, which may mean that the current indoor environment temperature is consistent with the preset target environment temperature, or that a difference between the current indoor environment temperature and the current preset target environment temperature is within a set allowable range.
The preset target ambient temperature and the preset shutdown target opening value are values preset according to actual needs. Wherein the shutdown target opening degree value is an opening degree that the electronic expansion valve needs to reach in the cooling/heating stop state. In the cooling/heating stop state, the opening degree required for the electronic expansion valve is generally a fixed value. Therefore, the shutdown target opening value is preset, and when the current indoor environment temperature is matched with the preset target environment temperature, the shutdown target opening value is used as the current target opening value, so that the operation is convenient and fast.
Further, the shutdown target opening value is 0. Because the fan does not start heat exchange when the indoor air conditioning unit is in a refrigeration/heating stop state, the electronic expansion valve should be closed under normal conditions when the refrigeration/heating stop state is adopted, otherwise, the refrigerant is easy to return to the compressor to cause the fault of the compressor. By setting the shutdown target opening value to 0, the current target opening value is 0, and after step S180 is executed, it is ensured that the electronic expansion valve is closed.
In one embodiment, the current operating parameters further include a current heat exchanger inlet tube temperature. The inlet pipe temperature of the heat exchanger refers to the temperature of an inlet pipe opening of the heat exchanger. Correspondingly, step S160 includes: calculating the deviation value of the current indoor environment temperature and the current heat exchanger inlet pipe temperature; and if the deviation value between the current indoor environment temperature and the current heat exchanger inlet pipe temperature is greater than or equal to the preset shutdown allowable deviation value, the electronic expansion valve has a fault of inaccurate opening degree, and the electronic expansion valve is reset.
Specifically, the control device calculates an absolute value of a difference between the current indoor environment temperature and the current heat exchanger inlet pipe temperature to obtain a deviation value between the current indoor environment temperature and the current heat exchanger inlet pipe temperature. The preset shutdown allowable deviation value is a value preset according to actual needs. The deviation value of the current indoor environment temperature and the current heat exchanger inlet pipe temperature is greater than or equal to the condition of the preset shutdown allowable deviation value, the electronic expansion valve is indicated to have an inaccurate opening fault, and at the moment, the control equipment resets the electronic expansion valve.
When the indoor air conditioning unit is in a cooling/heating stop state, the temperature of the inlet pipe of the heat exchanger is basically close to the indoor environment temperature. Therefore, the control equipment compares the indoor environment temperature with the heat exchanger inlet pipe temperature, judges whether the electronic expansion valve has an inaccurate opening fault according to the compared deviation value, and is high in accuracy. For example, referring to fig. 2, a flowchart of a detailed embodiment is shown.
In one embodiment, the current operating parameters further include a current heat exchanger inlet tube temperature and a current heat exchanger outlet tube temperature. The temperature of the outlet pipe of the heat exchanger refers to the temperature of the outlet pipe opening of the heat exchanger. Correspondingly, in this embodiment, step S140 further includes: and if the current indoor environment temperature is not matched with the preset target environment temperature, inquiring a target opening value corresponding to the current heat exchanger inlet pipe temperature and the current heat exchanger outlet pipe temperature from the stored target data relation table to obtain the current target opening value.
The target data relation table records a plurality of groups of corresponding relation data, and one group of corresponding relation data comprises heat exchanger inlet pipe temperature, heat exchanger outlet pipe temperature and a target opening value. That is, one heat exchanger inlet pipe temperature and one heat exchanger outlet pipe temperature correspond to one target opening degree value. Specifically, the control device queries the heat exchanger inlet pipe temperature consistent with the current heat exchanger inlet pipe temperature and the heat exchanger outlet pipe temperature consistent with the current heat exchanger outlet pipe temperature in the target data relation table, and takes the target opening value corresponding to the heat exchanger inlet pipe temperature and the heat exchanger outlet pipe temperature found from the target data relation table as the current target opening value.
The control equipment can receive the heat exchanger inlet pipe temperature, the heat exchanger outlet pipe temperature and the indoor environment temperature which are acquired by the corresponding temperature sensors. And when the current indoor environment temperature is not matched with the preset target environment temperature, the unit is indicated to be operated in a cooling/heating state. For an air conditioning unit which operates in a refrigerating/heating state, the opening degree required by an electronic expansion valve in the operation process can be changed along with the working state, and the principle of the opening degree is to ensure that the flow of a refrigerant in a heat exchanger is proper, so that the liquid refrigerant is just completely evaporated into a gaseous refrigerant after heat exchange. The corresponding current target opening value is determined according to the current heat exchanger inlet pipe temperature and the current heat exchanger outlet pipe temperature, and the accuracy is high.
Further, the target data relationship table may be generated from experimental data. Before step S140, specifically, before step S120, the method may further include: setting the temperature of an inlet pipe of the heat exchanger and the temperature of an outlet pipe of the heat exchanger and adjusting the opening of the electronic expansion valve until no liquid refrigerant flows out of the heat exchanger; and taking the opening degree of the electronic expansion valve regulated by each group of experiments as a target opening degree value, taking the temperature of the inlet pipe of the heat exchanger, the temperature of the outlet pipe of the heat exchanger and the opening degree of the electronic expansion valve of each group of experiments as a group of corresponding relation data, and generating a target relation data table according to each group of corresponding relation data.
The target relation data table is generated through experiments, the accuracy of the corresponding relation among the heat exchanger inlet pipe temperature, the heat exchanger outlet pipe temperature and the target opening degree value is high, and therefore the accuracy of the current target opening degree value determined based on the target data relation table is high. It is understood that, in other embodiments, a calculation model representing the correspondence relationship between the heat exchanger inlet pipe temperature, the heat exchanger outlet pipe temperature and the target opening degree value may be established according to data obtained through experiments.
In one embodiment, step S160 includes: determining a current theoretical opening value according to the current indoor environment temperature, the current outlet pipe temperature of the heat exchanger and the current outlet pipe temperature of the heat exchanger; calculating a deviation value between the current theoretical opening value and the current target opening value; and if the deviation value of the current theoretical opening degree value and the current target opening degree value is greater than or equal to the preset operation allowable deviation value, the electronic expansion valve has an inaccurate opening degree fault, and the electronic expansion valve is reset.
Specifically, the control device calculates an absolute value of a difference between the current theoretical opening degree value and the current target opening degree value to obtain a deviation value of the current theoretical opening degree value and the current target opening degree value. The preset operation allowable deviation value is a value preset according to actual needs. And if the deviation value of the current theoretical opening value and the current target opening value is greater than or equal to the preset operation allowable deviation value, indicating that the electronic expansion valve has an inaccurate opening fault. At this time, the control device resets the electronic expansion valve.
For an electronic expansion valve, the electronic expansion valve generally only has a function of passively controlling the opening degree and does not have a function of collecting; that is, the electronic expansion valve may receive an instruction indicating the number of steps sent by the control device to adjust the opening degree, but the control device cannot directly acquire the actual opening degree of the electronic expansion valve. And the current theoretical opening degree value determined according to the current indoor environment temperature, the current outlet pipe temperature of the heat exchanger and the current outlet pipe temperature of the heat exchanger is approximate to the actual opening degree of the electronic expansion valve. By comparing the current theoretical opening degree value with the current target opening degree value, whether the electronic expansion valve has an inaccurate opening degree fault or not is judged according to the compared deviation value, and the accuracy is high. For example, referring to fig. 3, a flowchart of a detailed embodiment is shown.
In one embodiment, the step of determining the current theoretical opening value based on the current indoor ambient temperature, the current heat exchanger outlet pipe temperature, and the current heat exchanger outlet pipe temperature may include: and inquiring the current indoor environment temperature, the current heat exchanger outlet pipe temperature and the theoretical opening value corresponding to the current heat exchanger outlet pipe temperature from the stored inlet pipe outlet pipe data relation table to obtain the current theoretical opening value. The inlet pipe and outlet pipe data relation table records a plurality of groups of corresponding relation data, and one group of corresponding relation data comprises indoor environment temperature, heat exchanger inlet pipe temperature, heat exchanger outlet pipe temperature and theoretical opening value.
The specific implementation manner of obtaining the current theoretical opening degree value by querying from the inlet pipe-outlet pipe data relation table by the control device is similar to the specific implementation manner of obtaining the current target opening degree value by querying from the target data relation table, and is not described herein again. Similarly, the pipe inlet and outlet data relation table may be generated by performing an experiment on the experiment set before step S140, specifically before step S120, and the accuracy is high.
The method for correcting the opening degree of the electronic expansion valve of the unit can be applied to indoor air conditioning units and can also be applied to other units containing the electronic expansion valve. In another embodiment, the current operating parameter includes a current temperature of the pre-valve bulb and a current temperature of the post-valve bulb. The front valve temperature sensing bulb is arranged on the upstream side of the electronic expansion valve in the liquid flowing direction of the pipeline where the electronic expansion valve is located, and the rear valve temperature sensing bulb is arranged on the downstream side of the electronic expansion valve in the liquid flowing direction of the pipeline where the electronic expansion valve is located. That is, when viewed from the liquid flow direction of the pipe in which the electronic expansion valve is located, the liquid flows to the electronic expansion valve through the pipe position corresponding to the position of the bulb before the valve, and flows from the electronic expansion valve to the pipe position corresponding to the position of the bulb after the valve. The control device may collect the temperature of the bulb before the valve and the bulb after the valve.
Correspondingly, in the present embodiment, referring to fig. 4, step S160 includes step S161 to step S165.
S161: and determining the current theoretical opening value according to the current temperature of the bulb in front of the valve and the current temperature of the bulb behind the valve.
Specifically, the control device may query a theoretical opening value corresponding to the current temperature of the thermal bulb in front of the valve and the current temperature of the thermal bulb in back of the valve from the stored data relation table of the thermal bulb, and obtain the current theoretical opening value. The temperature sensing bulb data relation table records a plurality of groups of corresponding relation data, and one group of corresponding relation data comprises the temperature of a temperature sensing bulb in front of the valve, the temperature of the temperature sensing bulb behind the valve and a theoretical opening value.
S163: and calculating the deviation value of the current theoretical opening value and the current target opening value.
Specifically, the control device calculates an absolute value of a difference between the current theoretical opening degree value and the current target opening degree value to obtain a deviation value of the current theoretical opening degree value and the current target opening degree value.
S165: and if the deviation value of the current theoretical opening degree value and the current target opening degree value is greater than or equal to the preset operation allowable deviation value, the electronic expansion valve has an inaccurate opening degree fault, and the electronic expansion valve is reset.
And if the deviation value of the current theoretical opening value and the current target opening value is greater than or equal to the preset operation allowable deviation value, indicating that the electronic expansion valve has an inaccurate opening fault. At this time, the control device resets the electronic expansion valve.
By arranging the front valve temperature sensing bulb and the rear valve temperature sensing bulb in front of and behind the electronic expansion valve, the current theoretical opening value of the electronic expansion valve can be obtained more accurately, the accuracy of fault judgment is improved, and the reliability of unit operation is further improved.
Specifically, the current operating parameters include a current heat exchanger exit tube temperature and a current heat exchanger exit tube temperature. Correspondingly, in this embodiment, step S140 includes: and inquiring a target opening value corresponding to the current heat exchanger inlet pipe temperature and the current heat exchanger outlet pipe temperature from the stored target data relation table to obtain the current target opening value.
In one embodiment, the step of resetting the electronic expansion valve in step S160 includes: sending a full-open instruction to the electronic expansion valve, wherein the full-open instruction is used for controlling the electronic expansion valve to be fully open; and sending a full-closing instruction to the electronic expansion valve, wherein the full-closing instruction is used for controlling the opening degree of the electronic expansion valve to be closed to 0 step.
And (4) closing the opening of the electronic expansion valve to 0 step, namely fully closing the opening of the electronic expansion valve. Specifically, the step of sending a full-close command to the electronic expansion valve is executed after sending the full-open command to the electronic expansion valve, so that the opening degree of the electronic expansion valve is fully opened first and then fully closed. Therefore, the electronic expansion valve can be ensured to be accurately reset. For example, the currently displayed opening of the electronic expansion valve is 200 steps, the actual opening of the electronic expansion valve is 300 steps, and if the electronic expansion valve is directly closed to 0 step, the electronic expansion valve is closed by 200 steps, that is, the electronic expansion valve is actually closed to 100 steps, and the reset requirement cannot be met. And the electronic expansion valve is controlled to be fully opened and then fully closed, so that the electronic expansion valve can be ensured to be actually closed to 0 step.
In one embodiment, step S180 is followed by: the number of times of adjusting the opening degree of the electronic expansion valve after the reset is adjusted is recorded, and the process returns to step S110.
The number of times of inaccurate opening degree faults of the electronic expansion valve is equal to the number of times of adjustment. Through the circulation execution, carry out circulation fault detection to electronic expansion valve, record the regulation number of times moreover, the number of times that the inaccurate trouble of opening takes place for user's understanding or inquiry electronic expansion valve of being convenient for, the convenience is high.
In one embodiment, after step S140, before resetting the electronic expansion valve when the electronic expansion valve has an inaccurate opening degree fault, the method further includes: if the adjusting times reach the preset times, outputting abnormal information of the electronic expansion valve; and if the adjusting times do not reach the preset times, executing the step of resetting the electronic expansion valve.
The preset times can be specifically set according to actual needs. The electronic expansion valve abnormality information is used for indicating that the electronic expansion valve is abnormal. If the adjusting times reach the preset times, the electronic expansion valve still has faults after being corrected for many times, and the electronic expansion valve fails. Specifically, the control device may output the abnormal information of the electronic expansion valve in various manners, for example, the abnormal information of the electronic expansion valve may be displayed by a display, the abnormal information of the electronic expansion valve may be broadcast by a voice broadcaster, or the abnormal information of the electronic expansion valve may be output by an audible and visual alarm.
Through setting the preset times, whether the adjustment times reach the preset times is compared to judge whether the electronic expansion valve is abnormal, the abnormality of the electronic expansion valve can be detected in time, and the abnormal information of the electronic expansion valve is output, so that a user can know the abnormality. Specifically, the adjustment number may be set to an initial value, for example, the initial value of the adjustment number is set to 0, and the initial value of the adjustment number is compared with the preset number when the electronic expansion valve is detected to have the inaccurate opening degree fault for the first time.
For example, referring to fig. 5, a flow chart of a method for correcting an opening degree of an electronic expansion valve of a unit according to a detailed embodiment is shown. Taking application to an air conditioning unit as an example, the unit electronic expansion valve opening correction method can detect a jammed electronic expansion valve during refrigeration, reset the electronic expansion valve, adjust the opening of the reset electronic expansion valve according to the current target opening value, and send out abnormal information of the electronic expansion valve if the electronic expansion valve is adjusted for multiple times and has no fault. The method for correcting the opening degree of the electronic expansion valve of the unit can detect whether the electronic expansion valve is completely closed during refrigeration shutdown, if not, the electronic expansion valve is reset, the opening degree of the reset electronic expansion valve is adjusted according to the current target opening degree value, and if the electronic expansion valve is not still failed after multiple times of adjustment, abnormal information of the electronic expansion valve is sent. The method for correcting the opening degree of the electronic expansion valve of the unit can detect the electronic expansion valve which is stuck during heating, reset the electronic expansion valve, adjust the opening degree of the reset electronic expansion valve according to the current target opening degree value, and send out abnormal information of the electronic expansion valve if the electronic expansion valve is not still in fault after multiple times of adjustment.
It should be understood that although the various steps in the flow charts of fig. 1-5 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1-5 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternating with other steps or at least some of the sub-steps or stages of other steps.
In one embodiment, a control device is provided, the internal structure of which may be as shown in fig. 6. The control device comprises a processor, a memory, a network interface, a display screen and an input device which are connected through a system bus. Wherein the processor of the control device is configured to provide computational and control capabilities. The memory of the control device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface of the control device is used for communicating with an external terminal through network connection. The computer program is executed by a processor to realize a method for correcting the opening degree of the electronic expansion valve of the unit. The display screen of the control device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the control device can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the control device, an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the configuration shown in fig. 6 is a block diagram of only a portion of the configuration associated with the present application and does not constitute a limitation on the control device to which the present application is applied, and a particular control device may include more or less components than those shown in the figures, or combine certain components, or have a different arrangement of components.
In one embodiment, a control device is provided, which includes a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the unit electronic expansion valve opening correction method when executing the computer program.
The control equipment realizes the steps of the method for correcting the opening of the electronic expansion valve of the unit, and similarly, the accuracy of the opening of the electronic expansion valve can be improved, so that the operation reliability of the unit is improved.
In one embodiment, an air conditioning system is provided, which includes an air conditioning unit and the aforementioned control device, the air conditioning unit includes a heat exchanger and an electronic expansion valve communicated with the heat exchanger through a pipeline, and the control device is connected with the electronic expansion valve.
The air conditioning unit comprises devices required by air conditioning refrigeration or heating. For example, the air conditioning unit includes a compressor, a four-way valve, etc., in addition to a heat exchanger and an electronic expansion valve.
According to the control system, due to the adoption of the control equipment, the accuracy of the opening of the electronic expansion valve can be improved in the same way, and therefore the operation reliability of the unit is improved.
In one embodiment, the air conditioning unit further comprises a front valve thermal bulb and a rear valve thermal bulb, the front valve thermal bulb is arranged on the upstream side of the electronic expansion valve in the liquid flowing direction of the pipeline where the electronic expansion valve is located, and the rear valve thermal bulb is arranged on the downstream side of the electronic expansion valve in the liquid flowing direction of the pipeline where the electronic expansion valve is located.
Specifically, the control device determines a current theoretical opening value according to the current temperature of the temperature sensing bulb in front of the valve and the current temperature of the temperature sensing bulb behind the valve, calculates a deviation value between the current theoretical opening value and a current target opening value, and if the deviation value between the current theoretical opening value and the current target opening value is greater than or equal to a preset operation allowable deviation value, the electronic expansion valve has an inaccurate opening fault and resets the electronic expansion valve.
By arranging the front valve temperature sensing bulb and the rear valve temperature sensing bulb in front of and behind the electronic expansion valve, the current theoretical opening value of the electronic expansion valve can be obtained more accurately, the accuracy of fault judgment is improved, and the reliability of unit operation is further improved.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The method for correcting the opening degree of the electronic expansion valve of the unit is characterized by being used for correcting the opening degree of the electronic expansion valve of an indoor air conditioning unit, and comprises the following steps:
acquiring current working parameters of the unit;
determining a current target opening value according to the current working parameters;
when the fault that the opening degree of the electronic expansion valve of the unit is inaccurate is detected according to the current working parameters, the electronic expansion valve is reset; wherein, resetting the electronic expansion valve includes: sending a full-open instruction to the electronic expansion valve, wherein the full-open instruction is used for controlling the electronic expansion valve to be fully opened; sending a full-closing instruction to the electronic expansion valve, wherein the full-closing instruction is used for controlling the opening degree of the electronic expansion valve to be closed to 0 step;
adjusting the opening degree of the electronic expansion valve after resetting according to the current target opening degree value;
the current operating parameter comprises a current indoor ambient temperature; the determining the current target opening value according to the current working parameter comprises:
if the current indoor environment temperature is matched with a preset target environment temperature and indicates that the air conditioning unit is in a refrigeration/heating stop state, taking a preset shutdown target opening value as the current target opening value; wherein the target opening degree value is an opening degree that the electronic expansion valve needs to reach in the cooling/heating stop state.
2. The method of claim 1, wherein the current operating parameters further include a current heat exchanger inlet temperature; when detecting that the electronic expansion valve of the unit has an inaccurate opening fault according to the current working parameters, resetting the electronic expansion valve, including:
calculating a deviation value between the current indoor environment temperature and the current heat exchanger inlet pipe temperature;
and if the deviation value between the current indoor environment temperature and the current heat exchanger inlet pipe temperature is greater than or equal to the preset shutdown allowable deviation value, the electronic expansion valve has an inaccurate opening fault, and the electronic expansion valve is reset.
3. The method of claim 1, wherein the current operating parameters further include a current heat exchanger inlet tube temperature and a current heat exchanger outlet tube temperature; the determining a current target opening value according to the current working parameter further comprises:
if the current indoor environment temperature is not matched with the preset target environment temperature, inquiring a target opening value corresponding to the current heat exchanger inlet pipe temperature and the current heat exchanger outlet pipe temperature from a stored target data relation table to obtain the current target opening value; the target data relation table records a plurality of groups of corresponding relation data, and one group of corresponding relation data comprises heat exchanger inlet pipe temperature, heat exchanger outlet pipe temperature and a target opening value.
4. The method of claim 3, wherein resetting the electronic expansion valve of the unit upon detecting an inaccurate opening fault of the electronic expansion valve based on the current operating parameters comprises:
determining a current theoretical opening value according to the current indoor environment temperature, the current heat exchanger outlet pipe temperature and the current heat exchanger outlet pipe temperature;
calculating a deviation value between the current theoretical opening value and the current target opening value;
and if the deviation value of the current theoretical opening degree value and the current target opening degree value is greater than or equal to the preset operation allowable deviation value, the electronic expansion valve has an inaccurate opening degree fault, and the electronic expansion valve is reset.
5. The method of claim 1, wherein the current operating parameters comprise a current temperature of a pre-valve bulb disposed upstream of the electronic expansion valve in a liquid flow direction of the conduit in which the electronic expansion valve is disposed, and a current temperature of a post-valve bulb disposed downstream of the electronic expansion valve in the liquid flow direction of the conduit in which the electronic expansion valve is disposed;
when detecting that the electronic expansion valve of the unit has an inaccurate opening fault according to the current working parameters, resetting the electronic expansion valve, further comprising:
determining a current theoretical opening value according to the current temperature of the temperature sensing bulb in front of the valve and the current temperature of the temperature sensing bulb behind the valve;
calculating a deviation value between the current theoretical opening value and the current target opening value;
and if the deviation value of the current theoretical opening degree value and the current target opening degree value is greater than or equal to the preset operation allowable deviation value, the electronic expansion valve has an inaccurate opening degree fault, and the electronic expansion valve is reset.
6. The method according to any one of claims 1-5, wherein after adjusting the opening degree of the electronic expansion valve after the resetting according to the current target opening degree value, further comprising:
and recording the adjusting times of the opening of the electronic expansion valve after the electronic expansion valve is adjusted and reset, and returning to the step of acquiring the current working parameters of the unit.
7. The method of claim 6, wherein, prior to resetting the electronic expansion valve when an inaccurate opening degree fault occurs in the electronic expansion valve, further comprising:
if the adjusting times reach preset times, outputting abnormal information of the electronic expansion valve;
and if the adjusting times do not reach the preset times, executing the step of resetting the electronic expansion valve.
8. A control device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor realizes the steps of the method of any one of claims 1 to 7 when executing the computer program.
9. An air conditioning system, comprising an air conditioning unit and the control device of claim 8, wherein the air conditioning unit comprises a heat exchanger and an electronic expansion valve communicated with the heat exchanger through a pipeline, and the control device is connected with the electronic expansion valve.
10. The air conditioning system of claim 9, wherein the air conditioning unit further comprises a front valve bulb and a rear valve bulb, the front valve bulb is disposed on an upstream side of the electronic expansion valve in a liquid flow direction of the pipe where the electronic expansion valve is located, and the rear valve bulb is disposed on a downstream side of the electronic expansion valve in the liquid flow direction of the pipe where the electronic expansion valve is located.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110094858B (en) * 2019-04-11 2021-04-23 海信(山东)空调有限公司 Control method and device of air conditioner electronic expansion valve, computer product and air conditioner
CN110906516B (en) * 2019-12-02 2021-06-29 四川长虹空调有限公司 Variable frequency air conditioner expansion valve initial opening control method and variable frequency air conditioner
CN111207482B (en) * 2020-01-07 2020-12-29 珠海格力电器股份有限公司 Air conditioner electronic expansion valve clamping adjustment control method and air conditioner
CN113446193A (en) * 2021-06-23 2021-09-28 珠海格力电器股份有限公司 Control method and device of centralized control refrigeration system and centralized control refrigeration system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102997518A (en) * 2012-09-25 2013-03-27 无锡溥汇机械科技有限公司 High-precision control method of heat exchange system
CN204493833U (en) * 2015-01-28 2015-07-22 山东宏力热泵能源股份有限公司 Electric expansion valve intelligent controlling device
CN105423498A (en) * 2015-12-21 2016-03-23 珠海格力电器股份有限公司 Control method of air-conditioning system and air-conditioning system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105588273B (en) * 2015-09-30 2018-10-09 青岛海信日立空调系统有限公司 A kind of aperture control method, indoor unit, outdoor unit and the air-conditioning of electric expansion valve
CN105222445B (en) * 2015-10-30 2017-11-17 Tcl空调器(中山)有限公司 Control method, device and the air-conditioner set and its control method of electric expansion valve
CN106352611B (en) * 2016-08-26 2018-11-20 芜湖美智空调设备有限公司 Multi-split air conditioner and its control method for electronic expansion valve
CN108180682B (en) * 2017-12-28 2020-06-09 Tcl空调器(中山)有限公司 Electronic expansion valve control method, air conditioning unit and computer readable storage medium

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102997518A (en) * 2012-09-25 2013-03-27 无锡溥汇机械科技有限公司 High-precision control method of heat exchange system
CN204493833U (en) * 2015-01-28 2015-07-22 山东宏力热泵能源股份有限公司 Electric expansion valve intelligent controlling device
CN105423498A (en) * 2015-12-21 2016-03-23 珠海格力电器股份有限公司 Control method of air-conditioning system and air-conditioning system

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